' s champion spark plug 400 that august , finishing 29th with a blown engine . he resigned from hen ##drick motorsports in september 1987 . although richmond attempted a comeback in 1988 , nascar suspended him for testing positive for banned substances . the substances were identified as sud ##af ##ed , a non @ - @ prescription over @ - @ the @ - @ counter all ##ergy medication , and ad ##vil , an over @ - @ the @ - @ counter pain relieve ##r . in april 1988 , richmond sued nascar over the suspension . although he re ##test ##ed later that year and was reinstated , he could not find a car to drive . in his final public appearance in
' s champion spark plug 400 that august, finishing 29th with a blown engine. he resigned from hendrick motorsports in september 1987. although richmond attempted a comeback in 1988, nascar suspended him for testing positive for banned substances. the substances were identified as sudafed, a non @ - @ prescription over @ - @ the @ - @ counter allergy medication, and advil, an over @ - @ the @ - @ counter pain reliever. in april 1988, richmond sued nascar over the suspension. although he retested later that year and was reinstated, he could not find a car to drive. in his final public appearance in